Felco 4/90 Spare Parts Bolt and Nut Kit for Pruning Shears is great way to keep your pruning shears in good working order. Contains all the necessary parts to repair or replace the bolts and nuts. Compatible with both left handed and right handed shears. High quality parts that are made to last. Easy to install and use. It is lightweight and resists wear. The bolts are made of stainless steel which is rust resistant. Contains center bolt (4/8) and nut (4/9) for use with Felco 4 (F4) pruners.